Direct observation of dynamic surface acoustic wave controlled carrier injection into single quantum posts using phase-resolved optical spectroscopy

TL;DR

This study demonstrates real-time control of carrier injection into quantum posts using surface acoustic waves, employing phase-resolved optical spectroscopy to observe dynamic acoustoelectric effects and exciton modulation.

Contribution

It introduces a phase-locking technique for surface acoustic waves combined with optical spectroscopy to monitor carrier injection dynamics in quantum nanostructures.

Findings

Dynamic control of neutral and charged excitons observed.

Preferential hole injection into localized states confirmed.

Surface acoustic wave frequency influences emission modulation.

Abstract

A versatile stroboscopic technique based on active phase-locking of a surface acoustic wave to picosecond laser pulses is used to monitor dynamic acoustoelectric effects. Time-integrated multi-channel detection is applied to probe the modulation of the emission of a quantum well for different frequencies of the surface acoustic wave. For quantum posts we resolve dynamically controlled generation of neutral and charged excitons and preferential injection of holes into localized states within the nanostructure.